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Question:

Which boot technique necessitates the use of a network interface?

A PXE
Explaination

Preboot Execution Environment (PXE) is a sort of boot that downloads an image from a network server. A fixed drive is a boot type that makes use of an internal hard disk drive (HDD) or solid-state drive (SSD). eSata is a form of external drive connector. FTP is a file transmission protocol, not a boot type.